Feature request: differentiate concealed dropouts in ld-analyse

[putnam]

When viewing frames in ld-analyse, dropouts can already be visually indicated. But if you run the dropout corrector, the dropouts still appear in ld-analyse (and in the "visible dropout" graph), even though they may have been concealed.

It would be cool to see perhaps another color to indicate a concealed dropout, and/or a way to see the visual dropout graph with and without concealments applied. It might help understand how well-concealed dropouts are on a given source. At the moment all we know is the number of concealments as text output on ld-dropout-correct; I'd love to see those concealments visually represented in ld-analyse in some way.